I got problem for admin login for weeks, I tried all solution I found, none of them works. Could anybody help me out from the issue please?

The solution I tried :

  1. add formkey
  2. commment cookie setting in Varien.php
  3. clear cookie

The solution works, but only works for the first login is:

delete content under /var/cache and /var/session

After that, I can login once. Once logout, can't login again.

Thanks a lot if anyone can help.

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